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JEE Mains · Maths · STD 11 - 10.2 parabola,ellipse,hyperbola

रेखा \( \alpha x+4y=\sqrt{7} \), जहाँ \( \alpha\in R \), दीर्घवृत्त \( 3x^{2}+4y^{2}=1 \) को प्रथम चतुर्थांश में स्थित बिंदु P पर स्पर्श करती है, तो P की नाभिकीय दूरियों में से एक ........... है।

  1. A \( \frac{1}{\sqrt{3}}-\frac{1}{2\sqrt{11}} \)
  2. B \( \frac{1}{\sqrt{3}}+\frac{1}{2\sqrt{5}} \)
  3. C \( \frac{1}{\sqrt{3}}-\frac{1}{2\sqrt{5}} \)
  4. D \( \frac{1}{\sqrt{3}}+\frac{1}{2\sqrt{7}} \)
Verified Solution

Answer & Solution

Correct Answer

(D) \( \frac{1}{\sqrt{3}}+\frac{1}{2\sqrt{7}} \)

Step-by-step Solution

Detailed explanation

\( \alpha x+4y-\sqrt{7}=0 \) touches \( 3x^{2}+4y^{2}=1 \) \( \therefore c^{2}=a^{2}m^{2}+b^{2} \) \( \frac{7}{16}=\frac{1}{3}\times\frac{\alpha^{2}}{16}+\frac{1}{4}\Rightarrow\alpha=3,-3 \) Tangent is \( 3x+4y-\sqrt{7}=0 \) Let the point of contact is \( P(x_{1}y_{1}) \)…
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